It seems like problems that were used in codeforces rounds #845, #846 and #848 still have no rating set, although like a month passed since rounds finished. Does anybody know what's the issue with assigning rating, and when will it be set?

Now codeforces has a small number of tags which make it almost impossible to look for distinct topic. I think it would be more convinient to have more tags to look for problems when you want to practice some topics. Is there any reason why codeforces cannot give a permission to high rated people to add their own tags?